1. (容器等)可回收的，可退回的
Returnable containers are intended to be taken back to the place they came from so that they can be used again.

2. (金钱、文件等)可退还的，可归还的
If something such as a sum of money or a document is returnable, it will eventually be given back to the person who provided it.

1. that may be returned

e.g. returnable bottles and cans
this merchandise is returnable if you save the receipt